CVE-2021-39344: KJM Admin Notices <= 2.0.1 Authenticated Stored Cross-Site Scripting

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-10-15 · updated 2026-06-17
Weakness: CWE-79

Description

The KJM Admin Notices WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization via several parameters found in the ~/admin/class-kjm-admin-notices-admin.php file which allowed attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 2.0.1. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled.

Affected products

KJM Admin Notices: through 2.0.1

References

https://github.com/BigTiger2020/word-press/blob/main/KJM%20Admin%20Notices.md
https://plugins.trac.wordpress.org/browser/kjm-admin-notices/trunk/admin/class-kjm-admin-notices-admin.php
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39344
https://github.com/BigTiger2020/word-press/blob/main/KJM%20Admin%20Notices.md
https://plugins.trac.wordpress.org/browser/kjm-admin-notices/trunk/admin/class-kjm-admin-notices-admin.php
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39344

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